RU2691599C1 - Adaptation of a communication line in multiple access systems without the need for permission - Google Patents

Abstract

FIELD: computer equipment.

SUBSTANCE: method includes steps of: determining a resource overload value for an access region of a transmission unit in a conflict environment (CTU) associated with an uplink transmission scheme without the need for permission in a multiple-access system; limiting value of the modulation and coding scheme (MCS) specifying the maximum MCS level for the access area CTU is determined based on the resource overload value and transmitting the MCS limitation value to the plurality of user devices (UEs) associated with the access area CTU.

EFFECT: technical result consists in improvement of spectrum use efficiency.

18 cl, 12 dwg

Description

The level of technology

The present invention relates to wireless communications including transmission schemes without the need for permission in multiple access systems. In wireless networks such as Long Term Evolution (LTE) networks, common data channels are often used for uplink communication (UL). The selection of a common data channel for uplink (UL) is usually based on the scheduling / resolution procedure, and the scheduling and resolution mechanisms are controlled in the network by the base station (BS). The user device (UE) sends a scheduling request to the UL to the base station. When a BS receives a scheduling request, the BS sends the UL grant to the UE, indicating the UL allocation of its resources. Then, the UE transmits data on the provided resource.

The header signaling resource for scheduling / resolution mechanisms can be quite large, especially in cases where the transmitted data is small. For example, transfers of small packets of about 20 bytes can use the resources of the scheduling / resolution mechanism, which constitute between 30% and 50% of the packet size. The scheduling / permitting procedures may also cause an initial data transfer delay. In a typical wireless network, there is often a minimum delay of 7-8 ms between the scheduling request sent and the first uplink data transmission.

Disclosure of the invention

In one embodiment, a method is proposed that includes: determining the amount of resource overload for an access area of a transmission unit under conflict conditions (CTU) associated with an uplink transmission scheme without needing permission in a multiple access system, determining limitations of the modulation and coding scheme (MCS) indicating the maximum MCS level for the CTU of the access area, based on the resource overload amount, and transmitting the MCS the limit value on the plurality of devices User events (UEs) associated with the CTU access area.

In another embodiment, a base station is provided, including a processor and a computer readable storage medium containing instructions stored thereon for execution by the processor. The instructions configure a processor to determine the amount of resource congestion for the access area of a transmission unit under conflict conditions (CTU) associated with an uplink transmission scheme without the need for permission in a multiple access system, determining the modulation scheme coding limit value (MCS) indicating the maximum MCS the CTU level of the access area, based on the amount of resource overload, and the MCS transmission of the limitation value on multiple user devices (UEs) associated with the CTU area access.

In another embodiment, a method is proposed that includes: receiving from the base station a magnitude of a modulation and coding scheme constraint (MCS) for the access area of a transmission unit in collision conditions (CTU) associated with an uplink transmission scheme without the need resolution in the multiple access system, determine on the first user device (UE) the first MCS index within the MCS of the limit value, and transmit the first uplink transmission to the base station using iem CTU CTU access to the first area. The first uplink transmission includes user data and a first MCS index determined on the first UE.

In another embodiment, a user device (UE) is provided that includes a processor and a computer readable storage medium containing instructions stored thereon for execution by the processor. The instructions configure the processor to receive from the base station the magnitude of the modulation and coding scheme (MCS) limits for the access area of the transmission unit under conflict conditions (CTU) associated with the uplink transmission scheme without the need to allow the UE to first resolve MCS index within the MCS limit value, and transmit the first uplink transmission to the base station using the CTU in the first CTU access area. The first uplink transmission includes user data and a first MCS index determined on the first UE.

This section "Disclosure of the invention" is provided for presentation in a simplified form of choice of concepts, which are further described below in the section "Implementation of the Invention". The content of the section "the disclosure of the invention" is not intended to identify key features or key features of the declared subject and is not intended to be used as an explanation in determining the scope of the declared subject. The claimed subject matter is not limited to implementations that solve any or all of the technical tasks described in the section "Prior Art".

Brief Description of the Drawings

FIG. 1 is a diagram depicting an example of a network in accordance with the disclosed technology.

FIG. 2 is a diagram depicting an example of a configuration of access areas of a transmission unit under conflict conditions (CTU) in accordance with the disclosed technology.

FIG. 3 is a diagram depicting an example of displaying CTUs on a CTU access area in accordance with the disclosed technology.

FIG. 4 is a flowchart describing base station operations in accordance with the disclosed technology.

FIG. 5 is a diagram depicting an example of resource allocation in the CTU of an access area, resulting in different overload factors.

FIG. 6 is a flowchart describing the MCS selection process of the base station size in accordance with the disclosed technology.

FIG. 7 is a flowchart describing operations of a user device in accordance with the disclosed technology.

FIG. 8 is a block diagram describing an example of signaling between a base station and a user device in accordance with the disclosed technology.

FIG. 9 is a diagram depicting an example of resource allocation in a CTU access area with reserved time-frequency resource areas for transmitting control information.

FIG. 10 is a flowchart describing an open loop communication link adaptation by a user device in accordance with the disclosed technology.

FIG. 11 is a flowchart describing the adaptation of a closed loop communication link by a base station in accordance with the disclosed technology.

FIG. 12 is a block diagram of a high level computing system that can be used to implement any of the computing devices described here, such as UEs and base stations.

The implementation of the invention

The following is a description of a wireless communication system and associated operation methods that provide link adaptation for uplink transmission schemes without the need for permission in multiple access architectures. Quasi-orthogonal multiple access schemes, such as low-density orthogonal frequency division multiplexing (LDS-OFDM) systems and sparse code multiple access systems (SCMA), allow resources to be overloaded between different user devices (UEs). Uplink transmissions without the need for authorization allows the user device to transmit uplink communications without a base station (BS) allocating resources for the request / grant mechanisms. Individual UEs compete for access to uplink resources without a request / grant mechanism. This provides a reduction in total network service resources for request / resolution signaling.

Adaptation of the communication link is provided to allow UEs to adapt the transmission, without the need for resolution, on the uplink based on local parameters such as channel state information, path loss level and / or traffic characteristics. This provides increased spectrum efficiency. UEs use tailored link adaptation, rather than predefined link definitions, which can be represented by traditional communications without permission. In addition, the base station may indicate MCS restrictions based on system loading. This can lead to an increase in the number of simultaneous-access UEs, as well as an increase in system capacity. The transmission scheme without the need for permission with the adaptation of the communication line can be defined by the base station or can be defined by the wireless standard.

A base station is described that implements a transmission scheme without the need for authorization with link adaptation. The base station is configured to determine the density of the UE and service requirements such as link budget, coverage area, etc. Based on these parameters, the base station determines the appropriate resource overload within the scheme without the need for permission to meet the required parameters. The base station may define a number of resources, such as transmission units under conflict conditions (CTUs), for allocating access areas to CTUs. Based on cell load or other parameters, the base station determines the maximum MCS level to use UEs in the access area CTU. The maximum MCS level is translated into UEs as the MCS limit. UEs select an MCS level within an MCS constraint based on local conditions for uplink transmissions to the base station. The UE provides the MCS with an index in the uplink transmission, which indicates the MCS level used to transmit data on the uplink channel. The base station refers to the MCS index to use the corresponding MCS level in decoding the uplink transmission.

FIG. 1 shows a block diagram of a network 100 in accordance with various embodiments. The base station (BS) 102 manages uplink and downlink communications for different UEs 104 within its coverage area 106. BS 102 may alternatively be referred to as a cell tower or site, macro cell, micro cell, base transceiver station (BTS), node B, eNodeB or eNB, an access network, and the like. BS 102 may support simultaneous transmissions on multiple cellular carriers. BS 102 implements an uplink transmission scheme without a grant, which defines the access areas of a transmission unit under conflict conditions (CTU) so that UEs 104 can compete for access to uplink resources without a request / grant mechanism. An uplink transmission scheme without the need for permission may be defined by the BS or may be set in a wireless communication standard (eg, 3GPP). UEs 104 may be mapped to different CTU access areas to avoid collisions (i.e., when two or more UEs attempt to transmit data on the same uplink resource). However, if a collision occurs, UEs 104 can resolve conflicts using the asynchronous HARQ (hybrid automatic retransmission request) method. BS 102 blindly (that is, without explicit signaling) detects active UEs and decodes received transmissions on the uplink.

Using this scheme, UEs 104 can send transmissions on the uplink without allocating resources by the BS for the request / grant mechanisms. Thus, common network service resources are saved. In addition, this system allows reducing the uplink transmission time bypassing the request / grant scheme. Although FIG. 1, only one BS 102 and six UEs 104 are illustrated, a typical network may include multiple BSs, each covering transmissions from a different set of UEs in its geographical area of coverage.

Network 100 uses various high-level signaling mechanisms to provide and configure transmissions without authorization. UEs 104, capable of transmitting without authorization, can signal this possibility in BS 102. This allows BS 102 to support both unauthorized transmissions and traditional signal / permission transmissions (for example, for older UE models) simultaneously. Relevant UEs may signal this capability, for example, by RRC signaling (radio resource management) defined in the 3GPP standard (third generation partnership project) (eg, as specified in the 3GPP standard TSPP.3.3.3 specification, radio resource management (RRC)). A new field may be added to the UE capability list in RRC signaling to indicate whether the UE supports transmission without permission. Alternatively, one or more existing fields may be modified or defined to indicate support for communication without authorization.

BS 102 also uses high-level signaling mechanisms (for example, a broadcast channel or a slow signaling channel) to direct information to UEs 104, which is necessary to ensure the operability and configuration of the transmission scheme without granting permission. For example, BS 102 may signal that transmissions are supported without permission, the search area and access codes for high-level CTU access areas, the maximum size of a set of signatures (that is, the total number of defined signatures), the installation of a modulation and coding scheme (MCS), etc. P. In addition, BS 102 may update this information from time to time using, for example, a slow signaling channel (for example, a signaling channel, for only on the order of hundreds of milliseconds instead of transmitting in each transmission time interval (TTI)).

BS 102 implements an uplink transmission scheme without authorization. The uplink transmission scheme without the need for permission determines the access area CTUs to provide data transmissions without the need for permission through UEs. CTU is a basic resource predefined by network 100 for competing broadcasts. Each CTU may be a combination of time, frequency, code domain elements, and / or pilot. Elements of the code domain can be CDMA codes (code division multiple access), LDS signatures (low density signatures), SCMA codebooks (sparse code multiple access), etc. Further, these possible elements of the code domain may be referred to generically as "signatures." Many UEs can compete for the same CTU. The CTU size is set by the network and can take into account the expected amount of transmission, the number of required additions and / or MCS levels.

The CTU access area is the time-frequency area in which the concurrent transmission occurs. An uplink transmission scheme without the need for permission may determine a plurality of CTU access areas for the network 100. The uplink transmission scheme without the need for permission may be determined by the BS 102 by high level signaling (for example, via a broadcast channel) or may be specified through the standard and implemented in UEs (for example, in UEs firmware). Areas may be formed in one or more frequency bands (in-band or inter-band) and may occupy the entire uplink bandwidth or part of the total transmission bandwidth of the BS 102 or the carrier supported by BS 102. CTU access area that occupies only part of the bandwidth , allows BS 102 to simultaneously support uplink transmissions within the traditional request / grant transmission scheme (for example, for older models of UEs that cannot support chi without granting permission). In addition, BS 102 may use unused CTUs for scheduled transmissions with a request / grant scheme, or BS 102 may adjust the CTU size of the access areas, if portions of the access areas are not used for a period of time. In addition, CTU access areas may periodically vary between frequencies. BS 102 may signal these changes in the size and CTU frequency of the access area in UEs 104 over the slow signaling channel.

Various embodiments as shown in FIG. 1 are described in relation to a specific context, namely LTE wireless communication network. However, various embodiments may also be applied to other wireless networks, such as global interoperability networks for microwave access (WiMAX), global system for mobile communications (GSM), universal mobile communications networks (UMTS), code-based multiple access networks channel separation (CDMA) and others.

FIG. 2 shows an exemplary configuration for different CTU access areas defined by BS 102. FIG. 2 BS 102 supports transmissions for three carriers, each of which operates at frequencies F ₁ , F ₂ and F ₃ with a bandwidth of BW ₁ , BW ₂ and BW ₃ . FIG. 2 illustrates examples of CTU access areas 200 defined on all three carriers using different configurations. The configurations shown in FIG. 2, are provided for illustrative purposes only, and alternative CTU configurations of the access area may be defined in various embodiments.

A plurality of CTU access areas (eg, as shown in FIG. 2) is classified for each CTU access area in order to provide different types of services to different types of UEs. For example, CTU access areas can be classified to support different levels of quality of service (QoS), different UE configurations (eg, carrier aggregation situations), different UE levels of service, different UE layouts, or a combination of these. In addition, each CTU access area may be configured to support a different number of UEs. The size of each CTU access area may vary depending on the expected number of UEs using the area. For example, the CTU size of the access area may be based on the load history of the access area CTU (for example, the number of UEs), the estimated collision probability of the UE, and / or the measured collisions of the UE during a specific time period.

FIG. 3 shows an exemplary definition of a CTU resource in different CTU access areas. FIG. 3 shows four CTU access areas 302-308. The available bandwidth is divided into time-frequency regions for the CTU access areas 302-308, with each access area 302-308 occupying a predetermined number of physical resource blocks (for example, access area 302 occupying PRBs 1-4) of the bandwidth. As shown in FIG. 3, CTUs are displayed identically on the access area 302-308, but for illustrative purposes, various forms of this display are shown.

FIG. 3, each CTU access area is capable of supporting up to thirty-six UEs competing for the thirty-six CTUs defined in each area. Each CTU is a combination of time, frequency, signature, and pilot. Each access area 302-308 occupies a certain time-frequency area. These time-frequency domains are further split into each reference six signatures (S ₁ -S ₆ ) and six pilot signals mapped to each signature to form a total of thirty-six pilot signals (P ₁ -P ₃₆ ). The pilot / signature decorator at BS 102 is used to detect and decode individual signals and UE transmissions.

In accordance with this scheme, different UEs transmit on the uplink on the same signature. Different embodiments support signature collisions (i.e., when multiple UEs simultaneously access the same time-frequency resources using the same signature). Although signature collisions may degrade UE functional characteristics, the transmitted information can be decoded by BS 102 using various decoding schemes (for example, the Integrated Message Transfer Pattern (JMPA) scheme described in detail in the following paragraphs). In addition, signature collisions between two UEs do not affect the performance of other UEs. Therefore, signature collisions do not adversely affect the overall performance of the system. Different embodiments embody a plurality of potential UEs at the same time-frequency resource signature, so that the system can be fully loaded with each transmission in the event of a conflict.

Pilot collisions may not be supported. Similar to signature collisions, collision of pilot signals refers to cases where several UEs simultaneously access the same time-frequency resources using the same pilot sequence. However, unlike signature collisions, collisions of pilot signals can cause the transmission scheme to fail without giving permission. BS 102 cannot decode UE transmission information in pilot collision scenarios, as BS 102 cannot estimate individual channels of UEs using the same pilot signal. For example, suppose that two UEs have the same pilot signal and their channels are h ₁ and h ₂ . BS 102 can only evaluate channel quality h1 + h2 for both UEs. Thus, the transmitted information will not be decoded correctly. Different embodiments may determine the number of unique pilots (for example, thirty-six pilots per access area in FIG. 3) depending on the number of UEs supported in the system. The specific amount shown in FIG. 3, is for illustrative purposes only, and the specific configuration of CTU access areas and CTUs may vary by network.

In various embodiments, an unauthorized transmission is provided by applying collision avoidance mechanisms by mapping / re-mapping UEs onto CTUs and resolving conflicts through asynchronous HARQ. In order to provide conditions for the UE to successfully perform uplink transmission in the scheme without granting permission, the UE determines the CTU on which data can be sent. The UE determines the CTU that it should use for transmissions based on predefined mapping rules, known as UEs (eg, UEs 104), and base stations (eg, BS 102) in a network (eg, network 100) in one embodiment. These mapping rules may be implicit (i.e., default) rules predefined for the UE (eg, in the applicable standard or in the UE software) and / or explicit rules defined by the BS using high level signaling. For example, various mapping rules (called display configurations) are predefined in a wireless communication standard, such as 3GPP (eg, as specified in 3GPP TS 36.213 Extended Universal Terrestrial Access (E-UTRA)), physical layer procedures), and an index of applicable display configuration transmitted to the UE via the BS.

The uplink transmission scheme, without the need for permission, assigns a unique, identifying CTU index, I _CTU for each CTU in the CTU access areas. The UE determines which CTUs to transmit based on the mapping rules for selecting the appropriate CTU index. The CTU index mapping can be evenly distributed among the available resources based on the size of the CTU regions in the time-frequency domain and in order to reduce the BS decoding complexity. The size of the CTU regions is taken into account, so that the UE does not map to the same subset of available time-frequency resources.

Traditionally, uplink transmission schemes without the need for permission are based on the predefined definition of the communication link between CTU access areas. Transmissions without the need for resolution reduce overhead and latency in order to efficiently use the available spectrum. UEs do not send resource requests to base stations, and base stations do not send resource permission messages to the UE. In order to properly decode an uplink transmission, the BS needs to use the appropriate MCS level that was used for the uplink. If the base station cycles through the multiple MCS layers until the signal is properly decoded using MCS from the UE, then this results in inefficient operation. Accordingly, a predetermined link definition is typically used to provide the base station with conditions for efficiently decoding an uplink transmission using a predetermined link definition. For example, the modulation and coding scheme may be predefined for use in one or more CTU access areas. Each UE uses predefined MCS for its uplink transmissions. Since the BS does not allocate resources in advance for requesting UEs in the uplink transmission scheme without the need for permission, the BS does not normally transmit link adaptation information to the UE. In addition, UEs use pre-defined MCS levels for transmissions without regard to local conditions and parameters. Although the use of a predefined MCS level for all transmissions can provide high reliability, associated constraints can lead to inefficient use of the frequency spectrum.

In accordance with the embodiments of the disclosed technology, an uplink transmission scheme without the need for permission includes adapting the communication line to increase spectrum utilization efficiency in transmissions without providing permission. In order to break the signaling delay, transmissions are provided without giving permission, while adapting the communication link from UEs to base stations to improve spectrum utilization efficiency. The base stations are configured to determine the density and maintenance requirements of the UE, such as link budget, coverage area, etc. Based on these parameters, the base station configures the transmission scheme without the need for authorization with an appropriate resource overload to meet the required parameters.

To satisfy cell requirements, a base station, for example, can determine the amount of resources, such as CTUs, for the CTU distribution of the access area. Based on cell loading, the base station determines the maximum MCS level that UEs can use in the CTU of the access area. For example, in response to an increase in cell load, the base station lowers the maximum MCS level in order to prevent interference between UEs in the coverage area. In response to a decrease in cell load, the base station increases the maximum MCS level to increase transmission speed and spectrum efficiency. The maximum MCS level is transmitted to the UE as an MCS limit. The UEs then select the MCS level in the MCS limit limits based on local conditions (such as channel quality, path loss, etc.) of uplink transmissions to the base station. The UE includes an MCS index in the uplink transmission, which indicates the MCS level used for data transmission on the uplink. The base station refers to the MCS index to use the corresponding MCS level to decode the uplink transmission.

FIG. 4 is a flowchart describing operations of a base station implementing a transmission scheme without the need for permission with link adaptation according to one embodiment. At step 400, a transfer scheme is implemented without permission. The transmission scheme may use one or more CTU access areas, and the base station may display various CTU indices on the access area CTUs. CTU access areas may be pre-determined or defined by the base station. Each CTU index corresponds to a CTU on which the UE can perform transmissions without granting permission. The BS may use high-level signaling (eg, via a broadcast channel) to transmit information that allows data to be transmitted without permission. High-level signaling may include mapping information on specific CTU access areas, the number of CTUs in the CTU access areas and / or the CTU index.

It should be noted that the base station does not need to explicitly define an uplink transmission scheme without granting permission. For example, parts or all of the transmission schemes without providing access may be defined by the standard. CTU access areas can be defined, for example, by standard. The base station may map the CTU indexes to the CTU access areas and transmit information to implement the transfer scheme without permission.

At step 402, the base station dynamically allocates a pool of resources for the coverage area corresponding to one or more CTU access areas. The base station determines the cell load level in the coverage area in step 402 to allocate several resources in the coverage area commensurate with the load. For example, the base station may determine the number of active UEs in the coverage area or the amount of traffic used for uplink transmissions in the coverage area. After determining or estimating the cell load level, the base station adapts the available physical resources to allocate a pool of resources with an appropriate amount of resources. The base station allocates more non-orthogonal resources in response to an increase in cell load and allocates fewer non-orthogonal resources in response to a decrease in cell load. Typically, the base station uniformly releases / adds resources based on the overload factor to be used. In the LDS-OFDM scheme, the base station may allocate more sparse spreading codes in different time-frequency domains to increase the resource pool. In the SCMA scheme, the base station can allocate more sets of SCMA code, which can be based on different orders of measurements of constellations or constellations.

In step 404, the base station determines the MCS limit value for one or more CTU access areas based on the level of resource overload in the access area CTU. The MCS limit value indicates the maximum MCS level that can be supported in uplink transmissions to the base station using UEs. For example, the MCS limit value may be the MCS index used when mapping different MCS indexes to different MCS levels. Allocating more non-orthogonal resources to a resource pool leads to a greater resource overload within the CTU access area. As resource congestion increases, link budget decreases in coverage. The base station determines the maximum MCS level that can be supported during uplink transmissions to the base station at the current resource overload level. The base station can consider the level of congestion, as well as the ability of the base station to determine the maximum MCS level. In one example, multiple levels of overload can be used in the CTU access area. Mapping of the degree of overload (also called overload coefficients) to different MCS levels can be used. Thus, the base station can select the maximum MCS level corresponding to the current overload factor for the CTU access area.

In one example, the MCS level corresponds to the LDS-OFDM modulation scheme and code rate. The link adaptation scheme uses a predefined mapping between MCS layers and modulation schemes and code rates in LDS-OFDM. In another example, the MCS level corresponds to different sets of SCMA codebooks (based on different constellation orders) and code rates in SCMA. The link adaptation scheme uses a predefined mapping between MCS levels and SCMA codebooks and SCMA code rates. For various examples, the mapping can be stored both at the base station and at the UE to determine the corresponding MCS parameters from the selected MCS level. The MCS index set can be used by base stations and UEs that indicate the corresponding MCS level. MCS levels can also be used in other multiple access systems.

In step 406, the base station broadcasts the available resource pool and MCS limit value for the UE in the coverage area. The MCS limit value sets the maximum MCS level that UEs can use for uplink transmissions using resources from the resource pool in one or more CTU access areas. UEs select a resource, such as a CTU, for transmission on the uplink from the available resource pool. UEs may then select the MCS level within the MCS limit values based on local parameters, such as channel conditions, etc., as described below.

At step 408, the base station receives the transmission on the uplink from the UE in the coverage area. Uplink transmission includes data as well as control information. The control information may include a UE identifier (UE ID) for identifying the UE sending the transmission on the uplink. At step 410, the base station accesses the MCS index included in the control information from the UE. The MCS index indicates the MCS level (within the MCS limit value) used by the UE to transmit on the uplink. In one example, control information in LTE is provided in an uplink control channel, such as a PUCCH.

At step 412, the base station blindly decodes the transmission on the uplink. In one example, the base station may use the unified message transfer algorithm (JMPA) and the active UE detection method. The base station uses the MCS index to access the display of SCMA or LDS-OFDM information, such as codebook sets and code rates used in uplink transmissions. The base station decodes the transmission on the uplink using the corresponding MCS information.

At step 414, the base station determines if the decoding was successful. If the decoding was successful, the base station indicates to the UE that the decoding was successful at step 416. The base station may send an acknowledgment message (eg, ACK) at step 416 in response to successful decoding. The base station may possibly send a NACK signal in response to a bad decoding if the UE ID is successfully decoded from the uplink control information.

If decoding is not performed at step 414 or after sending the indication at step 416, the base station updates the traffic statistics at step 420. The base station may measure the uplink signal-to-noise ratio or signal-to-interference ratio plus noise (SINR) associated, for example , with transmissions from individual UEs. The base station may monitor or develop long-term statistics related to detection characteristics in the uplink and / or competition probabilities. The base station may use this statistical information to dynamically allocate the resource pool and / or determine the MCS limit value.

In one embodiment, as described in FIG. 4, the base station includes an implementation element that implements the transmission scheme without the need for resolution, an allocation element that dynamically allocates a resource pool, an overload element that determines the degree of resource overload for the first collision transmission unit access area (CTU) associated with an uplink transmission scheme without permission representation, a constraint value setting element that defines the magnitude of the modulation and coding scheme constraint (MCS), specifying moiety maximum MCS level for the first access region CTU, and a broadcast unit which broadcasts MCS value limit set on the user devices (UEs), associated with the first access region CTU.

FIG. 5 is a block diagram describing an example of a transmission scheme without the need for resolution and various overload factors that may be used. FIG. 5 shows four blocks of physical resources PRB1, PRB2, PRB3 and PRB4. As also shown in FIG. 3, these four physical resource blocks may correspond to a single CTU access area (for example, 302). FIG. 5, an SCMA scheme having an SCMA code length of four is described using four subcarriers. Each subcarrier may be differently overloaded to achieve different levels of resource overload within the CTU access area. For example, the number of CTUs in the CTU access area may vary to achieve different overload factors. In the LDS-OFDM scheme, the base station can change the size of the resource pool by allocating a different number of sets of sparse extension codes in the time-frequency domains. In the SCMA scheme, the base station may allocate a different number of sets of SCMA codes, which may be based on different orders of the SCMA constellation. It is clear that the configuration in FIG. 5 is presented as an example only. Other modulation schemes can be used, as well as CTU access areas of any size and configuration.

The first line in FIG. 5 depicts an example CTU access area with an overload factor of 0.5. The overload factor can be determined in various ways. In one example, the overload factor is based on the number of CTUs that are allocated to the first access area CTU and the number of active UEs. The overload coefficient can be equal to the distribution coefficient of the allocated CTUs and the number of active UEs. In another example, uplink traffic in the first CTU is used instead of the number of active UEs to determine the overload factor. In another example, the overload coefficient is equal to the SCMA coefficient of the code length and the number of active UEs. FIG. 5 shows two UEs with an SCMA code length of 4, which results in an overload factor of 0.5. SCMA code is sparse code. In this case, two UEs share four PRBs. UE1 includes a non-zero value in PRB1 and PRB2, while UE2 includes a non-zero value in PRB2 and PRB4. In this case, there is no difference between physical resource blocks of different UEs.

The second line in FIG. 5 depicts an example CTU access area with an overload factor of 1.0. In this case, with an SCMA code length of four, four UEs share four PRBs, so the overload factor is 1.0. UE1 includes non-zero values in PRB1 and PRB2, while UE2 includes non-zero values in PRB2 and PRB4. UE3 includes non-zero values in PRB1 and PRB2, while UE4 includes non-zero values in PRB3 and RPB4. In this scenario, UE1 and UE3 compete for the first PRB1, UE2 and UE3 compete for the second PRB2, UE1 and UE4 compete for the third PRB3 and UE2 and UE4 compete for the fourth PRB4. For example, UE1 and UE3 use different signatures represented by different cross lines to access the PRB1 to provide multiple access.

The third line in FIG. 5 depicts an example CTU access area with an overload factor of 1.5. In this case, when the SCMA code length is four, six UEs share four PRBs, so each PRB is shared by three UEs. User UE1-UE4 includes non-zero values in the PRBs, as shown on the second line. In addition, UE5 includes non-zero values in PRB1 and PRB4 and UE6 includes non-zero values in PRB2 and PRB3. Thus, UE1, UE3 and UE5 compete for the first PRB1, UE2, UE3 and UE6 compete for the second PRB2, UE1, UE4 and UE6 compete for the third PRB3 and UE2, UE4 and UE5. UE1, UE3 and UE5 compete for the fourth PRB4, for example, use different signatures (for example, code words) represented by different cross-strokes to access PRB1 to provide multiple access. The scenarios shown in FIG. 5 are presented as an example, since multiple variations of overload factors and subcarriers can be used.

FIG. 6 is a flowchart describing the process by the base station for setting the MCS limit value to access the CTU of the access area in the transmission scheme without granting permission. At step 452, the base station determines the amount of resource overload associated with the CTU access area. The base station can dynamically allocate resources to generate a pool of resources by overloading blocks of physical resources. The base station can dynamically allocate CTUs to the CTU access area by adjusting the number of codebook sets used in the CTU access area. The amount of resource overload is based on the distribution of non-orthogonal resources in the CTU of the access area and can be determined from the overload factor. The overload factor is associated with the available link budget for the CTU access area. A higher load factor results in a smaller link budget. A lower load factor results in a larger link budget.

At step 454, the base station determines the capabilities of the base station. The base station can determine the available processing options and the amount of resource allocation. At step 456, the base station determines the maximum MCS level that can be maintained in the uplink for the CTU access area. The maximum MCS level is based on the amount of resource congestion (which affects the uplink link budget) and the base station capabilities. In one example, the base station uses the overload coefficient mapping for the MCS levels in step 456. The MCS level indicated by the mapping can be adjusted based on the current capabilities of the base station. Typically, the base station detects a higher maximum MCS level in response to a low overload factor and a lower maximum MCS level in response to a high overload coefficient. In response to a low overload rate, the link budget for the CTU access area is higher. You can use a more aggressive and high-performance MCS level. Accordingly, the base station determines that a higher maximum MCS level can be maintained. In response to a high overload rate, the available link budget is reduced. Accordingly, the base station determines that a lower or more conservative MCS level can be maintained. At step 456, the base station attempts to determine the maximum MCS level, ensuring that the uplink communication satisfies the communication threshold in one embodiment.

At step 458, the base station selects the MCS limit value for broadcast to UEs in the coverage area. In one example, the MCS limit value indicates the maximum MCS level that UEs can use in the CTU of the access area. The MCS limit value can be specified as the MCS index in one embodiment. The mapping or table of MCS indices for different MCS levels may be used by UEs and base stations. For example, index 1-16 can be used to denote sixteen MCS levels with lower MCS index values corresponding to lower MCS levels. The base station and the UEs may comprise mapping each MCS index for modulation and coding values. For example, each MCS index may indicate a modulation scheme and coding rate (for example, LDS-OFDM) or different sets of code books and coding rate (for example, SCMA).

FIG. 7 shows a flowchart describing the operations performed by the UE in a non-grant transmission scheme that uses adaptation of the communication link in connection with the uplink transmissions. At step 502, the UE receives an indication of a pool of available resources and an MCS limit value from the base station. The UE may receive an indication upon entering the coverage area for the base station or periodically receive an indication when the resource pool and the MCS update the limit values. An indication may identify one or more CTU access areas and the total number of CTUs allocated for each CTU access area.

At step 504, the UE determines channel state information and / or path loss information related to the CTU access areas. For example, if the UE is in time division duplex (TDD) mode, then it is possible to determine the channel state information at step 504. If the UE is in frequency division duplex mode (FDD), then it is possible to determine the path loss information on step 504. In step 506, the UE determines the characteristics of the uplink traffic. For example, the UE may determine the degree of reliability and / or the amount of delay associated with the uplink data for transmission to the base station.

At step 508, the UE determines the CTU on which the uplink transmission is performed. The UE may select a CTU based on channel state information and / or uplink traffic characteristics. In another example, the UE may randomly select a CTU or determine a CTU index based on default mapping rules. At step 510, the UE selects the transmit power for transmission on the uplink based on the estimated path loss obtained in step 504. In one embodiment, the path loss estimate is based on an estimate of the downlink transmissions.

In step 512, the UE selects the MCS level within the MCS of the limit amount provided by the base station in the broadcast. When determining the MCS level, various UE parameters may be used. The UE selects the maximum possible MCS level based on the channel state information and the characteristics of the uplink traffic in one embodiment. For example, in response to channel state information that indicates a free channel or a low-interference channel, the UE may select a high MCS level to ensure high transmission performance. However, if the channel state information is not favorable, the UE may select a lower MCS level to provide a higher likelihood of successful uplink transmission. If uplink traffic requires high reliability, it is possible to select a relatively low MCS level within the MCS limit value. Similarly, if uplink traffic requires a low latency, then a lower MCS level can be chosen.

In one embodiment, the UE uses the power reduction value to select the MCS level. For example, the UE may determine the maximum possible MCS level to be used for the uplink, and then reduce the MCS level according to the power reduction value. Thus, the system can provide greater reliability by using MCS levels that are lower than those that are possible. While lower MCS levels may result in slow processing of individual uplink channels, this may lead to greater overall system performance by reducing the number of retransmissions required.

For example, the UE may use a small link budget and reach the maximum transmit power (for example, the UE is not in the cell boundary region or when the channel status is low). The UE may further reduce the selected MCS level based on the actual estimated link budget.

In step 514, the UE sends an uplink transmission using the selected CTU with the selected MCS level and transmit power. The UE sends data for transmission on the uplink, as well as control information. The control information includes an MCS index corresponding to the MCS level selected in step 512. The MCS index is used by the base station to determine the corresponding MCS level to decode the uplink transmission. The control information may also include UE identifier information.

At step 516, the UE determines whether the uplink transmission to the base station was successful. For example, the UE may be in idle mode for a predetermined period of time to receive an ACK message. If an ACK message is received, the uplink channel processing ends at step 518. The UE may proceed to perform an additional task or prepare an additional uplink transmission.

If the ACK message is not received, then the UE determines that the transmission was not successful due to a collision, for example. At step 520, the UE determines whether the number of transmission attempts exceeds a threshold value. If the number of retries does not exceed the threshold value, then the UE performs the asynchronous HARQ method at step 522 to resolve the conflict.

If the threshold number of transmission attempts has not been exceeded, the UE may access the retransmission parameters at step 524. For example, the retransmission parameters may indicate the retransmission parameters. Retransmission parameters may indicate that the same resource (for example, CTU) should be used with the same code during transmission. Alternatively, retransmission parameters may indicate that the same resource should be used, but with a different code for retransmission. Alternatively, retransmission parameters may indicate that another resource should be used for retransmission. You can use different thresholds to specify to use all or part of various methods. For example, a UE may try to use the same resource with the same code until the first threshold value is reached, and then try to use the same resource with a different code until the second threshold value is reached. In response to reaching the second threshold, the UE may attempt to use another resource.

In one embodiment, as described in FIG. 7, the UE includes a reception element that receives from the base station a modulation coding scheme limit value (MCS) associated with a first access area of a transmission unit under collision conditions (CTU) in an uplink transmission scheme without authorization, the determination unit which defines in the first user device (UE) the first MCS index within the MCS of the limitation value, and the transmission element, which transmits the first transmission on the uplink to the base station using the CTU in the first CTU area before mortar. The first uplink transmission includes user data and the first MCS index defined in the first UE.

FIG. 8 shows a high level block diagram describing the signaling between base station 102 and UE 104 to implement link adaptation in a transmission scheme without granting permission. At step 552, the base station 102 transmits the MCS limit value to the UEs in its coverage area. Various mechanisms can be used for broadcasting. The base station may use various high-level signaling, such as a broadcast channel or a slow signaling channel, to indicate to UEs that transmissions can be used without granting permits with link adaptation within the MCS limit values.

In step 554, the UE sends an uplink transmission to the base station. An uplink transmission includes a portion of data containing user data for transmission and routing by the base station, as well as control information. The control information may be sent to the CTU of the access area using the reserved time-frequency combination, as described below. The control information includes an MCS index indicating the MCS level that the UE used when sending the transmission on the uplink. The base station uses the MCS index to determine the MCS level, which is used to decode the uplink transmission.

In step 556, the base station transmits specific installation parameters to the UE to the UE. For example, a base station may determine a particular MCS level or transmit power to be used for a particular UE. The base station may transmit these specific UE setup parameters using a broadcast channel or a slow signaling channel. Step 556 is possible and can be performed at any time. For example, a BS may track uplink transmissions associated with a UE over time to form a specific MCS index or power parameters.

At step 558, the base station broadcasts the MCS limit value to the UEs in its coverage area. Step 558 is performed periodically when the cell is loaded and when other conditions change. Base stations track traffic within the coverage area and can adjust the CTU access area and CTU distribution. Based on adjustments or traffic characteristics, the base station may update the MCS limit value and broadcast the updated MCS index for the limit value in step 558.

FIG. 9 is a block diagram describing an example of transmitting control information for adapting a communication link in a transmission scheme without granting permission. FIG. 9 shows an example shown in FIG. 5, which depicts four physical resource blocks PRB1, PRB2, PRB3 and PRB4. The scenario is again shown with the CTU access area configured with an overload factor of 1. UE1 uses PRB1 and PRB2, UE2 uses PRB2 and PRB4, UE3 uses PRB1 and PRB2 and UE4 uses PRB3 and RPB4.

The fixed resource set 602, 604, 606 and 608 is reserved in the CTU access area. Fixed resource 602 is in the reserved area of PRB1, fixed resource 604 is in the reserved area of PRB2, fixed resource 606 is in the reserved area of PRB3 and fixed resource 608 is in the reserved area of PRB4. Fixed resources are reserved for transmission of control information including MCS information. The MCS information may include an MCS index indicating the corresponding MCS level that the UE used to transmit on the uplink. In one embodiment, a predetermined MCS level is used to transmit fixed resources. Thus, the base station can decode the MCS index from the control information using a fixed MCS level and then decode the data based on the MCS index. For control information, a SCMA code set may be used, based on a lower constellation order, while a SCMA code set based on a higher constellation order may be used for data. This can provide higher reliability in determining control information for decoding data. In one embodiment, to prevent a conflict between the signaling (fixed MCS) and data (dynamic MCS), data transmission in the reserved areas is prohibited. Other control information may be transmitted, such as a HARQ identifier for HARQ processes.

When transmitting data using the CTU, the UE transmits the corresponding control information using a fixed resource in the corresponding block of physical resources. Thus, the MCS information is associated with the corresponding data using SCMA code sets that have the same non-zero positions. For example, UE1 transmits data to the CTU using the first physical resource block PRB1 and transmits control information to decode the data using fixed resource 602. Similarly, UE1 transmits data using the third physical resource block PRB3 and transmits control information using fixed resource 606. UE2 Transmits data using PRB2 and corresponding control information using fixed resource 604 and transmits data using PRB4 and corresponding control. information using a fixed resource 608. UE3 transmits data using PRB1 and corresponding control information using a fixed resource 602 and transmits data using PRB2 and corresponding control information using a fixed resource 604. UE4 transmits data using PRB3 and the corresponding control information from using fixed resource 606 and transmitting data using PRB4 and related control information using fixed Nogo resource 608.

FIG. 10 is a flowchart describing the adaptation of the open loop communication link performed by the UE in accordance with one embodiment. In step 652, the UE monitors the success rate for uplink transmission. The UE may increment the counter every time it receives an ACK message, for example, in response to an uplink transmission. The success rate can be defined as the ratio between the total number of received ACK messages and the total number of transmissions on the uplink. At step 654, the UE determines whether the success rate of transmission on the uplink exceeds the threshold value TH. In response to a successful transmission of the threshold value, the UE determines in step 656 whether the currently selected MCS index for uplink transmissions of the MCS is equal to the limit value set by the base station. In response to the MCS index being less than the MCS limit value, the UE increases the MCS index at step 658. In response to the MCS index being equal to the MCS limit value, the UE reduces the transmit power for uplink transmissions at step 660. The UE may reduce the transmit power using the specified step size. Thus, the UE will increase the MCS level for uplink transmissions, if, for example, the uplink transmission success rate exceeds a predetermined level. In response to the MCS level at the MCS limit value, the UE reduces the transmit power for uplink transmissions. Thus, the UE can save energy if it reaches the minimum value of the successful transmission coefficient. The UE may reset the success rate of the transmission on the uplink after making adjustments to the MCS index and / or transmit power.

In response to the fact that the success rate for transmission on the uplink is less than or equal to the threshold value, the UE tries to increase the ratio by adjusting the transmit power and / or MCS level. At step 664, the UE determines whether the currently selected transmit power is equal to the maximum power level that can be used. In response to the fact that the maximum transmit power level is not reached, the UE increases the transmit power at step 668. The predetermined step size can be used to increase the transmit power until the maximum power level is reached. In response to the achieved maximum power level, the UE decreases the MCS index in step 670. The UE decreases the MCS index to decrease the MCS level for uplink transmissions. Thus, the UE may increase the transmit power in the first attempt to achieve an acceptable uplink success rate. If the increase in power does not lead to an adequate result, the UE may reduce the MCS index in order to use more conservative MCS level to increase transmission efficiency.

As shown in FIG. 10, a single threshold value is used to determine whether the MCS index and / or transmit power should be adjusted. In one embodiment, the first and second threshold values are used when the first threshold value is greater than the second threshold value. If the success rate is higher than the first threshold, the UE increases the MCS index at step 658 or decreases the transmission power at step 660. If the success rate is lower than the first threshold, the UE determines if the success rate is lower than the second threshold. If the success rate is below the second threshold, the UE increases the transmit power at step 668 or decreases the MCS index at step 670. Thus, the UE can maintain the current power settings and MCS levels, while the transfer rate is higher than the minimum second threshold values, but less than the threshold for initiating an increase in MCS or a decrease in transmit power.

FIG. 11 is a flowchart describing operations performed by a base station to implement a closed loop link adaptation in accordance with one embodiment. In step 702, the base station measures the signal-to-interference plus noise (SINR) for uplink transmission from each UE. In step 704, the base station analyzes the SINR for each UE to determine if its uplink channel should be adapted to the base station. If the link to the base station is to be adapted, the base station selects the MCS level and / or transmit power level for the UE at step 706. For example, the base station may determine that the UE should use a lower MCS level than the one it chose, if the SINR is below the threshold. Similarly, the base station may determine that the UE should use a higher transmit power if the SINR is below the threshold value. In contrast, the base station may determine that the UE should use a higher MCS level if the SINR exceeds the threshold. Similarly, the base station may determine that the UE should use a lower transmit power if the SINR is above the threshold value.

In step 708, the base station sends the link adaptation information to the specific UE using the downlink control channel. The base station may use the slow signaling channel in one example. For example, the base station may send the MCS index or power control settings to the UE in the DCI format in the PDCCH. After transmitting the link adaptation information or determining that link adaptation is not required, the base station continues to perform the process in step 702 by measuring the SINR of the uplink transmissions.

FIG. 12 shows a block diagram of a high level computing system 50 that can be used to implement any of the computing devices described here, such as UEs 104 and base stations 102. The computing system shown in FIG. 12 includes a processor 80, a memory 82, a mass storage device 84, peripheral devices 86, output devices 88, input devices 90, removable storage unit 92, and display system 94. Computing devices, as described here, may include fewer or additional components than those described here. For example, the base station may not include peripheral devices 86, etc. For ease of description, the components shown in FIG. 12 are depicted as being connected via a single bus 96. However, the components may be connected by one or more means of data delivery. In one embodiment, the processor 80 and the memory 82 may be connected via a local microprocessor bus, and the mass storage device 84, the peripheral device 86, the removable storage unit 92, and the display system 94 may be connected via one or more I / O buses.

The processor 80 may comprise a single microprocessor, or may comprise a plurality of microprocessors for configuring a computer system as a multiprocessor system. Memory 82 stores instructions and data for programming processor 80 to implement the technology described here. In one embodiment, memory 82 may include dynamic random access memory banks, high-speed cache, flash memory, other non-volatile memory, and / or other information storage elements. The high-capacity storage device 84, which can be implemented with a magnetic disk drive or optical drive, is a non-volatile memory for storing data and code. In one embodiment, the high-capacity storage device 84 stores system software that programs processor 80 to implement the technology described herein. Removable storage unit 92 operates in conjunction with a portable non-volatile storage medium such as a floppy disk, CD-RW, flash memory / disk, etc. for input and output of data and code into the computing system shown in FIG. 10, and from it. In one embodiment, the system software for implementing the embodiments is stored on such a removable storage unit and is inserted into the computer system through the removable storage unit 92.

Peripheral devices 86 may include any computer support device, such as an input / output interface, for adding additional functionality to a computer system. For example, peripheral devices 86 may include one or more network interfaces for connecting a computer system to one or more networks, a modem, a router, a wireless device, etc. Input devices 90 provide a portion of the user interface and may include a keyboard or pointing device (such as a mouse, trackball, etc.). To display textual and graphical information, the computing system will (possibly) have a display system 94, which may include a video card and a monitor. Output devices 88 may include speakers, printers, network interfaces, etc. System 100 may also include a communication connection (s) 98, which allows a device to communicate with other devices via a wired or wireless network. Examples of connections for establishing a connection include network cards for connecting to a local network, wireless network cards, modems, etc. Communication connections can include hardware and / or software that provides communication using protocols such as DNS, TCP / IP, UDP / IP and HTTP / HTTPS, among others.

The components depicted in the computing system of FIG. 12 are those that are commonly used in computing systems, suitable for use with the technology described herein, and are intended to represent a wide category of such computer components that are well known in the art. You can use many different bus configurations, network platforms and operating systems.

The technology described here can be implemented using hardware, software, or a combination of both hardware and software. The software used is stored on one or more processor-readable storage devices described above (for example, memory 82, mass storage device 84, or removable storage unit 92) for programming one or more processors to perform the functions described here. Processor-readable storage media may include computer readable media, such as volatile and nonvolatile media, removable and non-removable media. By way of example, and not limitation, computer readable media may comprise computer readable media and communication media. Computer-readable media is intransitive and can be implemented in any method or technology for storing information, such as computer-readable instructions, data structures, program modules, or other data. Examples of computer-readable storage media include ROM, RAM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic storage or magnetic disk storage. other magnetic storage devices, or any other medium that can be used to store the required information with access to a computer. Communication media typically implements computer-readable instructions, data structures, program modules, or other data in a modulated data signal, such as a carrier wave or other delivery mechanism, and includes any storage media. The term "modulated data signal" means a signal that has one or more of its characteristics set or changed in such a manner as to encode information in the signal. By way of example, and not limitation, communication media includes wired media, such as a wired network or a direct wired connection, and wireless media, such as radio frequency (RF) and other wireless media. Combinations of any of the above are also included in the scope of computer-readable media.

In alternative embodiments, some or all of the software may be replaced with dedicated hardware, including specialized integrated circuits, logic chip arrays, FPGAs, PLDs, and special purpose computers. In one embodiment, software (stored on a storage device) implementing one or more embodiments is used to program one or more processors. One or more processors may interact with one or more computer-readable media / storage devices, peripherals, and / or communication interfaces. In alternative embodiments, some or all of the software may be replaced with dedicated hardware, including specialized integrated circuits, logic arrays, FPGAs, PLDs, and special-purpose computers.

The foregoing detailed description has been presented for purposes of illustration and description, which should not be considered exhaustive or limiting the subject matter stated herein for the disclosed exact form (s). In the light of the above description many changes and variations are possible. The described embodiments have been chosen to better explain the principles of the disclosed technology and its practical application, thereby allowing other specialists in the art to make the best use of the technology in various embodiments and with various modifications that are suitable for a particular use. It is intended that the scope of the invention be defined by the claims appended to this document.

Claims (61)

1. A method of adapting a communication line, comprising: determining the amount of resource overload for the access area of a transmission unit under conflict conditions (CTU) associated with an uplink transmission scheme without the need for resolution in a multiple access system; determining a modulation and coding scheme (MCS) limit value indicating the maximum MCS level for the CTU access area, based on the amount of resource overload and transmit the MCS value restrictions on the set of user devices (UEs) associated with the CTU access area. 2. The method according to p. 1, additionally containing phases in which: receive transmission on the uplink from the first UE from the plurality of UEs using the CTU; determining the MCS index from the control information contained in the uplink transmission; and attempt to blindly decode the uplink transmission data using the MCS level corresponding to the MCS index from the control information. 3. The method according to p. 2, in which: control information is located within the reserved time-frequency domain CTU of the access area; but the step of attempting blind decoding includes blind decoding the control information using a predetermined MCS level. 4. The method according to claim 1, further comprising stages on which: determining the link adaptation information for the first UE based on the monitoring of the uplink transmissions from the first UE and transmit, on the control channel, link adaptation information to the first UE. 5. The method according to p. 4, in which the link adaptation information for the first UE includes at least one of the MCS power setting parameters for the first UE. 6. The method according to p. 1, further comprising stages on which: monitoring uplink transmissions from multiple UEs in the access area CTU to detect one or more long-term statistics associated with uplink performance in the access area CTU; adjust the MCS limit value based on the specified one or more long-term statistics and transmit the adjusted MCS limit value to the set of UEs. 7. A method according to claim 1, further comprising: perform adaptive allocation of transmission units in conflict conditions (CTU) in the CTU access area based on the load in the CTU access area where the step of determining the amount of resource overload includes determining an overload factor based on the number of CTUs allocated for the first access area CTU and the number of active UEs. 8. The method according to p. 7, further comprising determine the number of CTUs to allocate CTU access areas based on at least one of the number of active UEs and the amount of uplink traffic. 9. The method according to claim 1, wherein the step of determining the MCS limit value comprises a sub-step, in which: selecting the first MCS limit value in response to the first overload coefficient and the second MCS limit value in response to the second overload coefficient, which is higher than the first overload coefficient; wherein The first MCS limit value corresponds to the first MCS level, which is higher than the second MCS level corresponding to the second MCS limit value. 10. Base station containing: processor and computer readable storage medium storing instructions that, when executed by the processor, cause the processor to execute: determining the amount of resource overload for the access area of a transmission unit under conflict conditions (CTU) associated with an uplink transmission scheme without the need for permission in a multiple access system; determining a modulation and coding scheme constraint (MCS) value indicating the maximum MCS level for the CTU of the access area based on the amount of resource congestion; and MCS transmissions of a limit value on a plurality of user devices (UEs) associated with the CTU access area. 11. A method for adapting a communication line, comprising: from the base station, a magnitude of a modulation and coding scheme (MCS) restriction for the access area of a transmission unit under conflict conditions (CTU) associated with an uplink transmission scheme without the need for permission in a multiple access system; determine on the user's device (UE) the first MCS index within the MCS limit values; and transmitting the first transmission on the uplink to the base station using the CTU in the CTU of the access region, the first transmission on the uplink including the user data and the first MCS index defined in the UE. 12. The method of claim 11, wherein the step of transmitting on the uplink includes sub-steps in which: transmit user data using the first MCS level corresponding to the first MCS index; and transmit the first MCS index using the specified MCS level within the reserved time-frequency domain CTU access area. 13. The method according to claim 11, further comprising: determining at least one channel state information or estimated path loss in the UE; but the step of determining the first MCS index includes selecting the first MCS index based on at least one of the channel state information and the estimated path loss. 14. The method according to p. 13, further containing a stage on which: determine, on the first UE, the uplink traffic characteristics; but the step of determining the first MCS index includes the selection of the first MCS index based on the uplink traffic characteristic and at least one of the channel state information or estimated path loss. 15. The method according to p. 14, further comprising a stage on which: determine the maximum MCS level based on the characteristics of the uplink traffic and at least one of the channel state information and estimated path loss; but the step of determining the first MCS index includes selecting the first MCS index by applying the power loss value to the maximum MCS level to determine the low MCS level corresponding to the first MCS index. 16. The method according to claim 11, further comprising: determine the success rate of transmission on the uplink to the UE; selecting the second MCS level within the MCS of the limiting value based on the success rate of transmission on the uplink; and transmitting the second transmission on the uplink in the second MCS level, the second transmission on the uplink including the second MCS index corresponding to the second MCS level. 17. User device (UE), containing: processor and computer readable storage medium storing instructions that, when executed by the processor, cause the processor to execute: receiving from the base station the magnitude of the modulation and coding scheme constraint (MCS) for the access area of a transmission unit under conflict conditions (CTU) associated with an uplink transmission scheme without the need for permission in a multiple access system; determining in the UE of the first MCS index within the MCS a limitation value; and transmitting the first uplink transmission to the base station using the CTU in the CTU of the access region, the first uplink transmission including user data and the first MCS index defined in the first UE. 18. A computer-readable storage medium storing a program causing, when executed by a computer, the execution by a computer of a method according to any one of claims. 1-9 and 11-16.

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